[docs] Improve SVD pipeline docs (#7087)
* update svd docs
* fix example doc string
* update return type hints/docs
* update type hints
* Fix typos in pipeline_stable_video_diffusion.py
* make style && make fix-copies
* Update src/diffusers/pipelines/stable_video_diffusion/pipeline_stable_video_diffusion.py
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
* Update src/diffusers/pipelines/stable_video_diffusion/pipeline_stable_video_diffusion.py
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
* update based on suggestion
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Co-authored-by: M. Tolga Cangöz <mtcangoz@gmail.com>
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
